Granted Patent B2

US 12,513,394 · App. 18/191,379 · Granted Dec 30, 2025

Inventors: Kenta Koiwai (Tochigi, JP); Masayasu Mizushima (Tochigi, JP); Yuichiro Kato (Tochigi, JP); Takeo Mori (Tochigi, JP); Akino Moriyoshi (Tochigi, JP); Toshimune Nagano (Saitama, JP); Toru Matsumoto (Tochigi, JP)

Assignee: CANON KABUSHIKI KAISHA

H04N23/671H04N23/687

Abstract

Claims (48)

1 . A control apparatus for a lens apparatus including an optical system that includes a first optical member movable to change at least one of a tilt of a focal plane relative to an imaging plane or a position of an imaging range and a second optical member movable during focusing, the control apparatus comprising:

at least one memory that stores a set of instructions; and

at least one processor that executes the set of instructions to:

control a movement of the first and second optical members;

acquire first information on (i) a moving amount by which the first optical member is moved and (ii) a position of the second optical member;

acquire second information on a relationship between (iii) a moving amount of the first optical member and (iv) a moving amount of the second optical member for correcting a defocus corresponding to the moving amount of the first optical member; and

correct the defocus caused by the movement of the first optical member by moving the second optical member based on the first information and the second information.

2 . The control apparatus according to claim 1 ,

wherein the lens apparatus further includes a first detector configured to detect the position of the second optical member, and a first moving unit configured to move the second optical member along an optical axis of the optical system, and

wherein the first information includes at least one of an output signal from the first detector, an input signal to the first moving unit, and an object distance.

3 . The control apparatus according to claim 1 ,

wherein the lens apparatus further includes a second detector configured to detect a position of the first optical member, and a second moving unit configured to move the first optical member, and

wherein the first information includes at least one of an output signal from the second detector and an input signal to the second moving unit.

4 . The control apparatus according to claim 1 ,

wherein the at least one processor corrects the defocus caused by moving the first optical unit to approach an in-focus state of the optical system from an in-focus state of the optical system before moving.

5 . The control apparatus according to claim 1 ,

wherein the first optical member is movable in a direction including a component vertical to the optical axis.

6 . A lens apparatus comprising:

the control apparatus according to claim 1 ; and

the optical system.

7 . A camera system comprising:

the lens apparatus according to claim 6 ; and

an image sensor that includes the imaging plane.

8 . An image pickup apparatus comprising:

the control apparatus according to claim 1 ; and

an image sensor that includes the imaging plane.

9 . A method for a lens apparatus including an optical system that includes a first optical member movable to change at least one of a tilt of a focal plane relative to an imaging plane or a position of an imaging range and a second optical member movable during focusing, the control method comprising:

controlling a movement of the first and second optical members;

acquiring first information on (i) a moving amount by which the first optical member is moved and (ii) a position of the second optical member;

acquiring second information on a relationship between (iii) a moving amount of the first optical member and (iv) a moving amount of the second optical member for correcting a defocus corresponding to the moving amount of the first optical member; and

correcting the defocus caused by the movement of the first optical member by moving the second optical member based on the first information and the second information.

10 . A non-transitory computer-readable storage medium storing a program that causes a computer to execute the method according to claim 9 .

11 . A control apparatus for a lens apparatus including an optical system that includes a first optical member movable to change at least one of a tilt of a focal plane relative to an imaging plane or a position of an imaging range and an aperture mechanism configured to change an aperture diameter of the optical system, the control apparatus comprising:

at least one memory that stores a set of instructions; and

at least one processor that executes the set of instructions to:

control a movement of the first optical member and a change of the aperture diameter;

acquire first information on (i) a moving amount by which the first optical member is moved and (ii) an aperture value of the optical system;

acquire second information on a relationship between (iii) a moving amount of the first optical member and (iv) a change amount of the aperture value for correcting a defocus corresponding to the moving amount of the first optical member; and

correct the defocus caused by the movement of the first optical member by changing the aperture diameter of the optical system based on the first information and the second information.

12 . A lens apparatus comprising:

the control apparatus according to claim 11 ; and

the optical system.

13 . A camera system comprising:

the lens apparatus according to claim 12 ; and

an image sensor that includes the imaging plane.

14 . An image pickup apparatus comprising:

the control apparatus according to claim 11 ; and

an image sensor that includes the imaging plane.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (10)

Cited By (2)

US 12,671,904 US 12,689,826